Yakutat, Alaska · field elev 53 ft
Density Altitude at Alsek River (A57)
Alsek River sits at 53 ft, and even a typical August afternoon (62 °F) only lifts density altitude to about 267 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 28.6 | −1,993 ft | 34.8 | −1,557 ft |
| February | 30.6 | −1,852 ft | 37.8 | −1,348 ft |
| March | 31.9 | −1,760 ft | 40.0 | −1,196 ft |
| April | 38.6 | −1,293 ft | 46.9 | −725 ft |
| May | 45.6 | −813 ft | 53.7 | −267 ft |
| June | 51.9 | −388 ft | 58.8 | 70 ft |
| July | 55.4 | −154 ft | 61.6 | 254 ft |
| August | 54.7 | −201 ft | 61.8 | 267 ft |
| September | 49.4 | −556 ft | 56.9 | −55 ft |
| October | 41.9 | −1,065 ft | 48.9 | −589 ft |
| November | 33.7 | −1,634 ft | 40.1 | −1,189 ft |
| December | 30.8 | −1,838 ft | 36.4 | −1,445 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for A57
DENSITY ALTITUDE
Field elevation 53 ft — the air behaves like 280 ft.
- PRESSURE ALT
- 54 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
Nearby Alaska fields
- 3AK — Dry Bay
Yakutat · elev 33 ft
- A69 — Tanis Mesa
Yakutat · elev 183 ft
- AK76 — East Alsek River
Yakutat · elev 39 ft
- A67 — Harlequin Lake
Yakutat · elev 113 ft
- A68 — Situk
Yakutat · elev 60 ft
- PAYA — Yakutat
Yakutat · elev 40 ft
- PAHN — Haines
Haines · elev 29 ft
- PAGS — Gustavus
Gustavus · elev 36 ft
Frequently asked questions
How high does density altitude get at A57 in summer?
On a typical August afternoon — around 62 °F at the nearest NOAA normals station — density altitude at Alsek River reaches roughly 267 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at A57 on an average day?
It swings with the seasons: from roughly −1,993 ft at the coldest month's average temperature to about −154 ft at the warmest month's — all from a constant field elevation of 53 ft. The month-by-month table above carries the full year.
What is the field elevation of Alsek River?
53 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is A57 (FAA), in Yakutat, Alaska.